var $btn = $('.btn-all');
var $content = $('.content19');
var string1 = '<span class="icon icon-down"></span>';
$btn.click(function(){
	if($btn.html()==string1){
		
		console.log($content);
		$content.css('display','block');
		$btn.html('<span class="icon icon-up"></span>');
	}else{
		$content.css('display','-webkit-box');
		$btn.html('<span class="icon icon-down"></span>');
	}
})